Clinical characteristics.

Data are shown as numbers and as percentage. Skåne University Hospital, SUS, Lund is the tertiary center located in Skåne County. BMI was measured at the first visit at the prenatal care unit. Regarding medications, the patient was considered to be taking a prescribed medication during pregnancy even if the medication was only prescribed for part of the pregnancy. All women with missing data during pregnancy were considered not to have been prescribed any medications, if the report in medical journals before or after pregnancy indicated that they did not take any medications. Blood thinners is defined as the use of acetylsalicylic acid, P2Y12-inhibitors or low molecular weight heparin.